CONTENTS. 



PART I. 

 ART. I. — Description of fifty4wo Species of Unionidse. By Isaac Lea, ... 5 



ART. 11. — Supplement to Isaac Lea's paper on Unionidse, 55 



ART. III.— On the Homologies and Origin of the Types of Molar Teeth of Mam- 

 malia Educabilia. By Edw. D. Cope, 71 



PART II. . 



ART. IV.— On the Batrachia and Reptilia of Costa Rica. By E. D. Cope, . . 93 

 ART. v.— On the Batrachia and Reptilia collected by Dr. John M. Bransford during 



the IsTicaraguan Canal Survey of 1874. By E. D. Cope, 155 



ART. VI. — Report of the Reptiles brought by Prof. James Orton from the middle 



and upper Amazon and western Peru. By E. D. Cope, 159 



^ ART. VIL— K'ote on the Ichthyology of Lake Titicaca. By E. D. Cope, . . 185 

 ART. VIII. — A descriptive Catalogue of the Scalidse of the West India Islands. 



By 0. A. L. Morch, Ph.D., 189 



PART III. 



ART. IX. — Description of Vertebrate Remains, chiefly from the Phosphate Beds of 



South Carolina. By Prof. Jos. Leidy, 209 



ART. X. — Description of a Collection of Fossils made by Doctor Antonio Raimondi, 



in Peru. By Wm. M. Gabb, 263 



PART IV. 



ART. XL— Description of Caribbean Miocene Fossils. By Wm. M. Gabb, . . 337 

 ART. XII. — Descriptions of New Species of Fossils from the Pliocene Clay Beds 



between Limon and Moen, Costa Rica, together with E"otes on previously 



known species from there and elsewhere in the Caribbean Area. By "Wm. M. 



Gabb, 349 



ART. XIII. — The Terrestrial Mollusca inhabiting the Cook's or Harvey Islands. By 



Andrew Garrett, * . . 381 



ART. XIV. — The Placenta and Generative Apparatus of the Elephant. By Henry 



C. Chapman, M.D., . .413 



ART. XV.— The Parasites of the Termites. By Joseph Leidy, M.D., . . .425 

 ART. XVI. — Remarks on Bathygnathus borealis. By Joseph Leidy, M.D., . . 449 



Extra copies printed in advance for the authors. 



